<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>number</title>
		<script>
			alert(Number.MAX_VALUE);
			var p=4.567856456464646;
			var str=p.toFixed(3);
			alert(str);
		</script>
	</head>
	<body>
	</body>
</html>